Medium Connections Multi-DENCO
78 FläktGroup DC-2013-0101-GB • Subject to modifications • R5-08/2020
– Whenever possible it is recommended that "reverse return" piping (Tichelmann sys-
tem) be used for multiple installations to ensure an evenly balanced system.
– Regulating valves (preferably with pressure test points for measurement of volume
flow) should be used before each unit to enable balancing of water flow rates. This
regulating valve should be installed before each unit.
– Separate isolating valves should be provided at all equipment to enable servicing to
be carried out without draining the water circuit system.
– Thermometers and pressure gauge test points should be located in supply and
return lines of air handling units, heat rejection unit or chillers for commissioning and
normal service checks.
– All high points and coils of the water circuit must be provided with vent cocks to
enable system venting to prevent air locks. Your Multi-DENCO unit is already pro-
vided with a vent at the top of the coil.
– All coils and low points of the water circuit must be provided with drain cocks to
enable complete draining.
– Pipe expansion and contraction should be allowed for by the installation of expan-
sion bellows and loops (where necessary).
– A closed type expansion tank must be provided for the hydraulic system.
– Pipework must be properly cleaned and flushed.
– Pressurisation may be required to ensure a static head pressure is always available
to protect the circulation pump from cavitation.
NOTICE
The chilled water circuit must be protected from fouling, freezing or solid materi-
als. Failure to do so may result in poor performance or system failure.
• Install at least 1 water strainer per hydraulic circuit
• Provide frost protection though glycol or trace heating on external pipework
• Chemically treat condenser water served by an open evaporative cooling tower.
• Ensure filtration of solid materials within the circuit
We recommend using a plate heat exchanger for system separation.
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